Q11Multiple choice
During the process of ecological succession the changes that take place in communities are:
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Correct option: A
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Ans: (a) Orderly and sequential
NCERT Exemplar · Class 12 · Biology
Chapter 14: Ecosystem
Practice each question, then open the answer or worked solution.
Multiple Choice Questions
20 questionsQ12Multiple choice
Climax community is in a state of:
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Correct option: B
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Ans: (b) equilibrium
Q13Multiple choice
Among the following bio-geo-chemical cycles which one does not have losses due to respiration?
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Correct option: D
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Ans: (d) All of the above
Q14Multiple choice
The sequence of communities of primary succession in water is:
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Correct option: D
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Ans: (d) phytoplankton, rooted submerged hydrophytes, floating hydrophytes, reed swamp, sedges, meadow and trees.
Q15Multiple choice
The reservoir for the gaseous type of biogeochemical cycle exists in
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Correct option: B
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Ans: (b) atmosphere
Q16Multiple choice
If the carbon atoms fixed by producers already have passed through three species, the trophic level of the last species would be.
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Correct option: C
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Ans: (c) tertiary consumer
Q17Multiple choice
Which of the following type of ecosystem is expected in an area where evaporation exceeds precipitation, and mean annual rainfall is below 100mm
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Correct option: C
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Ans: (c) Desert
Q18Multiple choice
The zone at the edge of a lake or ocean which is alternatively exposed to air and immersed in water is called:
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Correct option: D
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Ans: (d) Littoral zone
Q19Multiple choice
Edaphic factor refers to:
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Correct option: B
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Ans: (b) Soil
Q20Multiple choice
Which of the following is an ecosystem service provided by natural ecosystem?
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Correct option: D
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Ans. (d) All of the above